#include "stm32f10x_adc.h"
#include "stm32f10x_dma.h"

volatile uint16_t ADCBuffer[] = {0x0000, 0x0000 ,0x0000};

void ADC_DMA_Init(void)
{
	GPIO_InitTypeDef GPIO_InitStructure;
	ADC_InitTypeDef ADC_InitStructure;
	DMA_InitTypeDef DMA_InitStructure;

	RCC_ADCCLKConfig(RCC_PCLK2_Div2);
    /* Enable ADC1 and GPIOA clock */
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1 | RCC_APB2Periph_GPIOA | RCC_APB2Periph_GPIOB | RCC_APB2Periph_AFIO, ENABLE);
	RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1 , ENABLE );

	DMA_InitStructure.DMA_BufferSize = 3;
	DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC;
	DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;
	DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)ADCBuffer;
	DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord;
	DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;
	DMA_InitStructure.DMA_Mode = DMA_Mode_Circular;
	DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)&ADC1->DR;
	DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord;
	DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
	DMA_InitStructure.DMA_Priority = DMA_Priority_High;
	DMA_Init(DMA1_Channel1, &DMA_InitStructure);
	DMA_Cmd(DMA1_Channel1 , ENABLE ) ;

	GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0 | GPIO_Pin_1;
	GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AIN;
	GPIO_Init(GPIOB, &GPIO_InitStructure);

	GPIO_InitStructure.GPIO_Pin = GPIO_Pin_7;
	GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AIN;
	GPIO_Init(GPIOA, &GPIO_InitStructure);

	ADC_InitStructure.ADC_ContinuousConvMode = DISABLE;//ENABLE;
	ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;
	ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_None;
	ADC_InitStructure.ADC_Mode = ADC_Mode_Independent;
	ADC_InitStructure.ADC_NbrOfChannel = 3;
	ADC_InitStructure.ADC_ScanConvMode = ENABLE;
	ADC_Init(ADC1, &ADC_InitStructure);
	ADC_RegularChannelConfig(ADC1, ADC_Channel_7, 1, ADC_SampleTime_239Cycles5);
	ADC_RegularChannelConfig(ADC1, ADC_Channel_8, 2, ADC_SampleTime_239Cycles5);
	ADC_RegularChannelConfig(ADC1, ADC_Channel_9, 3, ADC_SampleTime_239Cycles5);
	ADC_Cmd(ADC1 , ENABLE ) ;
	ADC_DMACmd(ADC1 , ENABLE ) ;
	ADC_ResetCalibration(ADC1);

	while(ADC_GetResetCalibrationStatus(ADC1));
	ADC_StartCalibration(ADC1);

	while(ADC_GetCalibrationStatus(ADC1));
	//ADC_SoftwareStartConvCmd ( ADC1 , ENABLE );
	//ADC now Start manually in TIM1_UP_IRQHandler
}
//=================================================================================

uint16_t ADC_DMA_GET(uint8_t ADC_DMA_n) {
	if (ADC_DMA_n < sizeof((ADCBuffer))) {
	  return ADCBuffer[ADC_DMA_n];
	}
	else {
		return 0;
	}
}
